Fine repeating line sets are created parallel to a diagonal line running from corner to corner of the 35mm frame, directly through the exact center of the image area. These are called sagittal lines, sometimes designated " S " on Canon's MTF charts. At a 90° angle to these, additional sets of repeating lines are drawn, called Meridional (or "M") line sets.
To the customer who purchased CN-E70-200mm T4.4 L IS KAS S : NOTE: When using the lens with the extender, be sure to adjust the back focus of the lens after attaching the extender.